Implement EXT_draw_buffers WebGL extention support in command buffer.

gpu/command_buffer/common/gles2_cmd_format_autogen.h

Index: gpu/command_buffer/common/gles2_cmd_format_autogen.h
===================================================================
--- gpu/command_buffer/common/gles2_cmd_format_autogen.h	(revision 186778)
+++ gpu/command_buffer/common/gles2_cmd_format_autogen.h	(working copy)
@@ -10936,6 +10936,93 @@
 COMPILE_ASSERT(offsetof(WaitSyncPointCHROMIUM, sync_point) == 4,
                OffsetOf_WaitSyncPointCHROMIUM_sync_point_not_4);
 
+struct DrawBuffersEXT {
+  typedef DrawBuffersEXT ValueType;
+  static const CommandId kCmdId = kDrawBuffersEXT;
+  static const cmd::ArgFlags kArgFlags = cmd::kFixed;
 
+  static uint32 ComputeSize() {
+    return static_cast<uint32>(sizeof(ValueType));  // NOLINT
+  }
+
+  void SetHeader() {
+    header.SetCmd<ValueType>();
+  }
+
+  void Init(GLsizei _count, uint32 _bufs_shm_id, uint32 _bufs_shm_offset) {
+    SetHeader();
+    count = _count;
+    bufs_shm_id = _bufs_shm_id;
+    bufs_shm_offset = _bufs_shm_offset;
+  }
+
+  void* Set(
+      void* cmd, GLsizei _count, uint32 _bufs_shm_id,
+      uint32 _bufs_shm_offset) {
+    static_cast<ValueType*>(cmd)->Init(_count, _bufs_shm_id, _bufs_shm_offset);
+    return NextCmdAddress<ValueType>(cmd);
+  }
+
+  gpu::CommandHeader header;
+  int32 count;
+  uint32 bufs_shm_id;
+  uint32 bufs_shm_offset;
+};
+
+COMPILE_ASSERT(sizeof(DrawBuffersEXT) == 16,
+               Sizeof_DrawBuffersEXT_is_not_16);
+COMPILE_ASSERT(offsetof(DrawBuffersEXT, header) == 0,
+               OffsetOf_DrawBuffersEXT_header_not_0);
+COMPILE_ASSERT(offsetof(DrawBuffersEXT, count) == 4,
+               OffsetOf_DrawBuffersEXT_count_not_4);
+COMPILE_ASSERT(offsetof(DrawBuffersEXT, bufs_shm_id) == 8,
+               OffsetOf_DrawBuffersEXT_bufs_shm_id_not_8);
+COMPILE_ASSERT(offsetof(DrawBuffersEXT, bufs_shm_offset) == 12,
+               OffsetOf_DrawBuffersEXT_bufs_shm_offset_not_12);
+
+struct DrawBuffersEXTImmediate {
+  typedef DrawBuffersEXTImmediate ValueType;
+  static const CommandId kCmdId = kDrawBuffersEXTImmediate;
+  static const cmd::ArgFlags kArgFlags = cmd::kAtLeastN;
+
+  static uint32 ComputeDataSize(GLsizei count) {
+    return static_cast<uint32>(
+        sizeof(GLenum) * 1 * count);  // NOLINT
+  }
+
+  static uint32 ComputeSize(GLsizei count) {
+    return static_cast<uint32>(
+        sizeof(ValueType) + ComputeDataSize(count));  // NOLINT
+  }
+
+  void SetHeader(GLsizei count) {
+    header.SetCmdByTotalSize<ValueType>(ComputeSize(count));
+  }
+
+  void Init(GLsizei _count, const GLenum* _bufs) {
+    SetHeader(_count);
+    count = _count;
+    memcpy(ImmediateDataAddress(this),
+           _bufs, ComputeDataSize(_count));
+  }
+
+  void* Set(void* cmd, GLsizei _count, const GLenum* _bufs) {
+    static_cast<ValueType*>(cmd)->Init(_count, _bufs);
+    const uint32 size = ComputeSize(_count);
+    return NextImmediateCmdAddressTotalSize<ValueType>(cmd, size);
+  }
+
+  gpu::CommandHeader header;
+  int32 count;
+};
+
+COMPILE_ASSERT(sizeof(DrawBuffersEXTImmediate) == 8,
+               Sizeof_DrawBuffersEXTImmediate_is_not_8);
+COMPILE_ASSERT(offsetof(DrawBuffersEXTImmediate, header) == 0,
+               OffsetOf_DrawBuffersEXTImmediate_header_not_0);
+COMPILE_ASSERT(offsetof(DrawBuffersEXTImmediate, count) == 4,
+               OffsetOf_DrawBuffersEXTImmediate_count_not_4);
+
+
 #endif  // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_AUTOGEN_H_